Walmart is now running a 90-day Rollback that allows you to save $0.10 a gallon on your fuel purchases at select Murphy USA and Walmart gas stations! To get this great deal, you have to make the gas purchase with a reloadable Walmart gift card, Walmart MoneyCard or Walmart credit card.
This discount is good until 8/30/2011. Make sure to check out all the locations that are participating.